Re: Honda "Express"ing difficulty...

Joe Woods /
This single post is part of a larger thread. Start from the top or view this post in context.

Timing adjustment is limited to setting point gap on these engines if the stator plate (the thing the points are mounted on) cannot be moved and the 'cam' on the cranksaft that the point's lever/pad rides on is in a fixed position.

I don't see how boring the cylinder and a piston change would change timing.. but who knows.. maybe something got tweaked during the process.

Another possibility that could explain symptoms of a pre-ignition type "ping" is a high compression ratio. This could be the result of a piston change if the new piston crown protrudes further into the combustion chamber than the old piston did.

Another possibility is compression ratio was raised by whoever did the cylinder work.. perhaps they cut something off the top of the cylinder, shortening it. Another possibility is the cylinder base gasket is missing (?) or needs to be thicker.

To test the possibility that compression ratio is too high, use a very thick head gasket or more than one head gasket. Use something near a total thickness of about one millimeter more than what is now there. This will lower compression ratio by a bunch, adding about 1.2ccs to the volume of the combustion chamber. If the pinging stops, you're on the right track..

This lower compression ratio might stop the ping.. however it could do this by just hiding and masking the source of the problem.. a misadjusted, very advanced ignition timing. In other words, it might not ping anymore but compression ratio was not the source of the ping.. excessive heat due to advanced ignition timing was.

So, in any case, check timing with a timing light or with the depth gauge method through the plug hole, or however the owner's manual instructs.

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Honda "Express"ing difficulty...Topic by: James Foster James Foster 02/25/05 11:22PM
  Re: Honda "Express"ing difficulty...Re: Dan Adams (50:1) Dan Adams (50:1) 02/25/05 11:39PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/25/05 11:57PM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/26/05 12:18AM
  Re: Honda "Express"ing difficulty...Re: Jonas Quimby Jonas Quimby 02/26/05 08:17AM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/26/05 12:41AM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/26/05 10:44AM
  Re: Honda "Express"ing difficulty...Re: Jason Luther Jason Luther 02/26/05 04:58PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/26/05 05:36PM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/26/05 05:46PM
  Re: Honda "Express"ing difficulty...Re: Jonas Quimby Jonas Quimby 02/26/05 09:32PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/26/05 08:53PM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/26/05 09:42PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/26/05 11:10PM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/26/05 11:55PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/27/05 12:39AM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/27/05 08:05PM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/27/05 08:57PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/27/05 10:29PM
  Re: Honda "Express"ing difficulty...Re: Jonas Quimby Jonas Quimby 02/28/05 04:52AM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/28/05 10:44AM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/28/05 07:01PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/28/05 08:44PM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/28/05 09:02PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/28/05 11:03PM
  Re: Honda "Express"ing difficulty...Re: Joe Woods Joe Woods 02/28/05 11:21PM
  Re: Honda "Express"ing difficulty...Re: James Foster James Foster 02/28/05 11:40PM

Want to post in this forum? We'd love to have you join the discussion, but first:

Login or Create Account